public static LinuxEventDevice[] WaitEvents(params LinuxEventDevice[] fds)
{
unsafe
{
// Build up fd_set for read:
const int FD_SETSIZE = 256;
const int NFDBITS = 8 * sizeof(ulong);
const int fd_size = FD_SETSIZE / NFDBITS;
ulong * fd_ptr = stackalloc ulong[fd_size];
int maxfd = 0;
foreach (var dev in fds)
{
int fd = dev;
if (fd > maxfd)
{
maxfd = fd;
}
fd_ptr[(fd / NFDBITS)] |= (1UL << (fd % NFDBITS));
}
// Await for read readiness:
//Debug.WriteLine("fd_ptr[0] = {0:X08}", fd_ptr[0]);
//Debug.WriteLine("select() blocked");
select(maxfd + 1, fd_ptr, null, null, IntPtr.Zero);
//Debug.WriteLine("select() unblocked");
// Count number of fds ready:
int numReady = 0;
for (int i = 0; i < fd_size; i++)
{
numReady += BitCount(fd_ptr[i]);
}
// Build set of fds that are ready:
var ready = new LinuxEventDevice[numReady];
int n = 0;
foreach (var dev in fds)
{
int fd = dev;
ulong mask = (1UL << (fd % NFDBITS));
if ((fd_ptr[(fd / NFDBITS)] & mask) == mask)
{
ready[n] = dev;
n++;
}
}
return(ready);
}
}
public void WaitEvents()
{
// Wait for events from our input files:
var ready = LinuxEventDevice.WaitEvents(fsw, touchScreen);
if (ready.Contains(fsw))
{
//Debug.WriteLine("fsw.PollEvents()");
fsw.PollEvents();
}
if (ready.Contains(touchScreen))
{
//Debug.WriteLine("touchScreen.PollEvents()");
touchScreen.PollEvents();
}
}
private unsafe void writeBytes(byte *buf, int count)
{
LinuxEventDevice.write(fd, buf, (uint)count);
}
public void Dispose()
{
LinuxEventDevice.close(fd);
}
public MidiAlsaOut(string devicePath = "/dev/snd/midiC1D0")
{
this.devicePath = devicePath;
this.fd = LinuxEventDevice.open(this.devicePath, LinuxEventDevice.OpenFlags.WriteOnly | LinuxEventDevice.OpenFlags.NonBlock);
}
public RpiPlatform(int display)
{
midi = new MidiAlsaOut();
fsw = new LinuxEventDevice("/dev/input/by-id/usb-413d_2107-event-mouse");
touchScreen = new LinuxEventDevice("/dev/input/event1");
fsw.EventListener += Fsw_EventListener;
touchScreen.EventListener += TouchScreen_EventListener;
bcmDisplay = (ushort)display;
bcm_host_init();
uint bcmWidth, bcmHeight;
graphics_get_display_size(bcmDisplay, out bcmWidth, out bcmHeight);
FramebufferWidth = Width = (int)bcmWidth;
FramebufferHeight = Height = (int)bcmHeight;
VC_RECT_T dst_rect;
VC_RECT_T src_rect;
dst_rect.x = 0;
dst_rect.y = 0;
dst_rect.width = Width;
dst_rect.height = Height;
src_rect.x = 0;
src_rect.y = 0;
src_rect.width = Width << 16;
src_rect.height = Height << 16;
// TODO: translate error codes into exceptions?
Debug.WriteLine("vc_dispmanx_display_open(...)");
dispman_display = vc_dispmanx_display_open(bcmDisplay);
Debug.WriteLine("dispman_display = {0}", dispman_display);
Debug.WriteLine("vc_dispmanx_update_start(...)");
dispman_update = vc_dispmanx_update_start(0 /* priority */);
Debug.WriteLine("dispman_update = {0}", dispman_update);
Debug.WriteLine("vc_dispmanx_element_add(...)");
dispman_element = vc_dispmanx_element_add(
dispman_update,
dispman_display,
0 /*layer*/,
ref dst_rect,
0 /*src*/,
ref src_rect,
DISPMANX_PROTECTION_T.DISPMANX_PROTECTION_NONE,
IntPtr.Zero /*alpha*/,
IntPtr.Zero /*clamp*/,
0 /*transform*/
);
Debug.WriteLine("dispman_element = {0}", dispman_element);
Debug.WriteLine("vc_dispmanx_update_submit_sync(dispman_update)");
checkError(vc_dispmanx_update_submit_sync(dispman_update));
// Create OpenVGContext:
Debug.WriteLine("new OpenVGContext()");
vg = new OpenVGContext();
}